Under ideal operating conditions, gearboxes generate vibrationsignals with frequency components that are pure harmonics of thegear meshing frequency. Developing tooth fatigue cracks introduceshort-time amplitude and phase modulations of the gear meshingvibration signal. Traditional techniques for gear fault detectionhave focused on either the time domain or the frequency domain. Thenewly developed wavelet transform enables one to look at theevolution in time of a signal’s frequency content. This property isvery well suited for the analysis of localized transients that aregenerated by the operation of faulty gears. In this study,magnitude wavelet maps of the vibration signal are calculated andused to assess the condition of an instrumented gear test rig. Akey finding is that the wavelet map of the residual vibrationsignal offers a better indicator to the presence of cracks than themap of the actual signal. The results obtained are also comparedagainst those of the well-accepted phase demodulation approach.
- Edition:
- 97
- Published:
- 11/01/1997
- Number of Pages:
- 8
- File Size:
- 0 files
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